AEMC 2135.39 [2135.39] Ground Rod, 14.5 in. T-shaped Auxiliary Ground Electrodes, Set of 2, for Ground Testers. The AEMC 2135.39 T-shaped ground rods are used as auxiliary ground electrodes when performing ground resistance and soil resistivity testing. The ground rods are for use with all AEMC ground testers (except clamp-ons). Overall length is 14.5". Set contains two ground rods. AEMC Instruments manufactures electrical testing and measurement instruments, including clamp meters, power quality analyzers, ground resistance testers, and data loggers. The company, founded in 1893, is headquartered in Foxborough, MA.